舰船冷却海水真空膜蒸馏淡化实验研究

Study on the Ship Cooling Seawater Desalination of Vacuum Membrane Distillation

采用NACE膜设计舰船冷却海水真空膜蒸馏淡化工艺流程,实验考察海水温度、海水流量、渗透侧真空度对产水通量的影响,通过连续运行实验考察膜通量的变化,并采取多种清洗方法比较膜通量的恢复情况。结果表明:舰船冷却水真空膜蒸馏海水淡化的产水通量受海水温度、海水流量、渗透侧真空度影响显著,适宜操作条件为进料海水温度70~80℃,海水流量35~40 L/min,真空度0.08~0.09 MPa。膜通量下降时采用0.5 mol/L稀盐酸清洗,通量能恢复98.8%。当海水流量40 L/min,水温80℃,真空度0.09 MPa时,膜通量达到18 L/(m^(2)·h)。

The technological process of ship cooling seawater desalination by vacuum membrane distillation(VMD)with the nano-structure high charge density electrolyte membrane(NACE)was designed.The effects of seawater temperature,flow rate and vacuum degree on water flux were investigated.The changes of membrane flux during continuous operation of membrane distillation system were studied.Different methods were used to clean the contaminated membrane to explore the recovery of membrane flux.The results showed that the flux of VMD was significantly affected by the seawater temperature,flow rate and vacuum degree.The suitable operating conditions of ship cooling seawater desalination by VMD were 70~80℃of temperature of seawater,35~40 L/min of seawater flux and the 0.08~0.09 MPa of vacuum degree for permeation side.The membrane flux regeneration can be realized to 98.8%by means of adding 0.5 mol/L dilute hydrochloric acid for cleaning.The membrane flux could reach 18 L/(m^(2)·h)when the flux of seawater was 40 L/min,the temperature of sea water was 80℃and the vacuum degree of permeation side was 0.09 MPa.